/*-
 * Copyright (c) 2005-2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
 * Redistribution and modifications are permitted subject to BSD license.
 */
#ifndef _PER_DECODER_H_
#define _PER_DECODER_H_

#include <asn_application.h>
#include <per_support.h>

#ifdef __cplusplus
extern "C" {
#endif

struct asn_TYPE_descriptor_s; /* Forward declaration */

/*
 * Unaligned PER decoder of a "complete encoding" as per X.691 (08/2015) #11.1.
 * On success, this call always returns (.consumed >= 1), as per #11.1.3.
 */
asn_dec_rval_t uper_decode_complete(
    const struct asn_codec_ctx_s* opt_codec_ctx,
    const struct asn_TYPE_descriptor_s* type_descriptor, /* Type to decode */
    void** struct_ptr,  /* Pointer to a target structure's pointer */
    const void* buffer, /* Data to be decoded */
    size_t size         /* Size of data buffer */
);

/*
 * Unaligned PER decoder of any ASN.1 type. May be invoked by the application.
 * WARNING: This call returns the number of BITS read from the stream. Beware.
 */
asn_dec_rval_t uper_decode(
    const struct asn_codec_ctx_s* opt_codec_ctx,
    const struct asn_TYPE_descriptor_s* type_descriptor, /* Type to decode */
    void** struct_ptr,  /* Pointer to a target structure's pointer */
    const void* buffer, /* Data to be decoded */
    size_t size,        /* Size of the input data buffer, in bytes */
    int skip_bits,      /* Number of unused leading bits, 0..7 */
    int unused_bits     /* Number of unused tailing bits, 0..7 */
);

/*
 * Aligned PER decoder of a "complete encoding" as per X.691#10.1.
 * On success, this call always returns (.consumed >= 1), in BITS, as per
 * X.691#10.1.3.
 */
asn_dec_rval_t aper_decode_complete(
    const struct asn_codec_ctx_s* opt_codec_ctx,
    const struct asn_TYPE_descriptor_s* type_descriptor, /* Type to decode */
    void** struct_ptr,  /* Pointer to a target structure's pointer */
    const void* buffer, /* Data to be decoded */
    size_t size         /* Size of data buffer */
);

/*
 * Aligned PER decoder of any ASN.1 type. May be invoked by the application.
 * WARNING: This call returns the number of BITS read from the stream. Beware.
 */
asn_dec_rval_t aper_decode(
    const struct asn_codec_ctx_s* opt_codec_ctx,
    const struct asn_TYPE_descriptor_s* type_descriptor, /* Type to decode */
    void** struct_ptr,  /* Pointer to a target structure's pointer */
    const void* buffer, /* Data to be decoded */
    size_t size,        /* Size of data buffer */
    int skip_bits,      /* Number of unused leading bits, 0..7 */
    int unused_bits     /* Number of unused tailing bits, 0..7 */
);

/*
 * Type of the type-specific PER decoder function.
 */
typedef asn_dec_rval_t(per_type_decoder_f)(
    const asn_codec_ctx_t* opt_codec_ctx,
    const struct asn_TYPE_descriptor_s* type_descriptor,
    const asn_per_constraints_t* constraints, void** struct_ptr,
    asn_per_data_t* per_data);

#ifdef __cplusplus
}
#endif

#endif /* _PER_DECODER_H_ */
